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Jets from early stages of heavy-ion collisions undergo modified showering in quark-gluon plasma (QGP) relative to vacuum due to jet-medium interactions, which can be measured using observables like differential jet shape and generalized angularities. Differential jet shape ( (R) ) encodes radially differential information about jet broadening and has shown an average migration of charged energy away from the axes of quenched jets from Pb+Pb collisions at the LHC. Measurements of generalized angularities in presence of the medium from Pb+Pb collisions at the LHC show harder, or more quark-like jet fragmentation relative to vacuum. Measuring these distributions in heavy-ion collisions at RHIC will help us further characterize jet-medium interactions in a phase-space region complementary to that of the LHC. In these proceedings, we present the first fully corrected measurements of (R), jet girth (g), momentum dispersion (pTD) and momentum difference of leading and subleading constituent particles (LeSub) observables, using hard-core jets in p+p collisions at s = 200 GeV, collected by the STAR experiment. Finally, the data are compared with model calculations and the physics implications are discussed.
T. Pani (Fri,) studied this question.